ADA suits target inaccessible business software; enterprise and government procurement asks for VPATs — accessibility is a market-access requirement wearing an ethics halo, and both reasons are sufficient.
Contrast ratios met, every action keyboard-reachable with visible focus, form fields labeled, images alt-texted, and semantic structure screen readers can parse — a component library that encodes these makes compliance a default, not a retrofit.
Scanner + keyboard pass + screen-reader smoke per release — an hour that keeps the audit boring and the users served.
Keyboard efficiency serves power users, contrast serves the warehouse tablet in sunlight, clear errors serve everyone — the overlap between accessibility and quality is nearly total.
Skipping the discipline this article describes until an incident, audit, or stalled project forces it — every practice above is cheaper adopted early than retrofitted under pressure.
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